Update comments to reflect new usage of #add_row method
Merge pull request #163 from ngpestelos/master

Update comments to reflect new usage of add_row
Updated chart vary_colors

This sets the proper default for each chart type and lets us change it
as we need.
Updated README as pre-release prep
Extracted type based cell serializers
Added docs for Axlsx#range_to_a
Added docs for Drawing#child_objects
Completed missing docs and pre-release prep
Allow other sheet as data source for pivot tables and fix hard coded sheet name in Pivot Table Cache Definition
add lineChart (2D) and show_marker to LineSeries (for 2D line chart)
fix loading LineChart
only yield if block given
fix line chart name
add test and remove activesupport methods
Added 2.0.0 to rubies for travis-ci
First run at 'hidden' comments WIP

The xml is genrated correcty, but the comment still shows until it is
selected once in the excel ui - so I must be missing something.
Merge pull request #178 from Programatica/master

Add LineChart
Fixed LineChart and refactored chart axes management
marking 1.8.7 as an allowed failure
Updated master branch travis-ci build stats badge

This should always point to master